118 lines
2.3 KiB
Go
118 lines
2.3 KiB
Go
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package api
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import (
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"embed"
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"fmt"
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"html/template"
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"io/fs"
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"net/http"
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"path/filepath"
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"strings"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
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)
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//go:embed tpl
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var tplFS embed.FS
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func mustReadTplFile(fileName string) string {
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path := filepath.Join("tpl", fileName)
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b, err := fs.ReadFile(tplFS, path)
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if err != nil {
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panic(fmt.Errorf("reading file %q from tplFS: %w", path, err))
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}
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return string(b)
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}
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func (a *api) mustParseTpl(name string) *template.Template {
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blogURL := func(path string) string {
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trailingSlash := strings.HasSuffix(path, "/")
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path = filepath.Join(a.params.PathPrefix, "/v2", path)
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if trailingSlash {
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path += "/"
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}
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return path
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}
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tpl := template.New("").Funcs(template.FuncMap{
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"BlogURL": blogURL,
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"AssetURL": func(path string) string {
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path = filepath.Join("assets", path)
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return blogURL(path)
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},
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})
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tpl = template.Must(tpl.Parse(mustReadTplFile(name)))
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return tpl
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}
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func (a *api) mustParseBasedTpl(name string) *template.Template {
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tpl := a.mustParseTpl(name)
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tpl = template.Must(tpl.New("base.html").Parse(mustReadTplFile("base.html")))
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return tpl
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}
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type tplData struct {
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Payload interface{}
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CSRFToken string
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}
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func (t tplData) CSRFFormInput() template.HTML {
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return template.HTML(fmt.Sprintf(
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`<input type="hidden" name="%s" value="%s" />`,
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csrfTokenFormName, t.CSRFToken,
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))
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}
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// executeTemplate expects to be the final action in an http.Handler
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func executeTemplate(
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rw http.ResponseWriter, r *http.Request,
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tpl *template.Template, payload interface{},
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) {
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csrfToken, _ := apiutil.GetCookie(r, csrfTokenCookieName, "")
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tplData := tplData{
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Payload: payload,
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CSRFToken: csrfToken,
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}
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if err := tpl.Execute(rw, tplData); err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("rendering template: %w", err),
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)
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return
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}
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}
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func (a *api) executeRedirectTpl(
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rw http.ResponseWriter, r *http.Request, path string,
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) {
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executeTemplate(rw, r, a.redirectTpl, struct {
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Path string
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}{
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Path: path,
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})
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}
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func (a *api) renderDumbTplHandler(tplName string) http.Handler {
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tpl := a.mustParseBasedTpl(tplName)
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if err := tpl.Execute(rw, nil); err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("rendering %q: %w", tplName, err),
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)
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return
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}
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})
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}
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